programmatic GUI callback function

Question

Chandrasekhar 2014-12-24

0
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https://ww2.mathworks.cn/matlabcentral/answers/167944-programmatic-gui-callback-function

评论： Chandrasekhar 2014-12-24

I want to access the GUI control from the call back function. how can I do this. I got the below code from Matlab help but it gives an error when executed. How can I access the slider from the call back function.

function mygui()
   figure
   uicontrol('Style','slider','Callback',@display_slider_value);
end
function display_slider_value(hObject,callbackdata)
   newval = num2str(hObject.Value);
   disp(['Slider moved to ' newval]);
end

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Answer 1

Geoff Hayes 2014-12-24

1
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https://ww2.mathworks.cn/matlabcentral/answers/167944-programmatic-gui-callback-function#answer_163236

在 MATLAB Online 中打开

Akshata - what is the error message? Note that if you are trying to get the current value of the slider, you could try using

newval = num2str(get(hObject,'Value'));

The above assumes that the error has something to do with the current line that gets the newval.

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Geoff Hayes 2014-12-24

在 MATLAB Online 中打开

The error message is indicating that you are trying to access a field of an object that is not a structure. In your case, hObject is not a structure and so you can't access Value from it. Which version of MATLAB are you using?

To get around this error, replace your line with

newval = num2str(get(hObject,'Value'));

as described above.

Chandrasekhar 2014-12-24